TY - JOUR
T1 - Microstructure and properties of highly porous Y2SiO5 ceramics produced by a new water-based freeze casting
AU - Zhang, Rubing
AU - Fang, Daining
AU - Chen, Xiangmeng
AU - Pei, Yongmao
AU - Wang, Zhengdao
AU - Wang, Yuesheng
PY - 2013/4
Y1 - 2013/4
N2 - This study introduced a new structural/functional porous yttrium silicate (Y2SiO5) ceramic, which was prepared using a water-based freeze-casting technique. Moreover, the effects of sintering temperature on the microstructure, compressive strength, thermal conductivity, and dielectric properties of porous Y2SiO5 ceramics were investigated. The microstructure consisting of 3-D interconnected pores were created using the freezing process, and the formation mechanism was discussed. The microstructure observation indicated an increase in the sintering temperature from 1250°C to 1450°C and a decrease in porosity from 71% to 62%. In addition, the pore channel size decreased from 50μm to 25μm, but the average grain size increased from 1.0μm to 3.0μm. Consequently, the compressive strength, thermal conductivity, and dielectric constant of the porous Y2SiO5 ceramics increased from 3.34MPa to 16.51MPa, from 0.07W/mK to 0.22W/mK, and from 1.89 to 2.22, respectively. Porous Y2SiO5 ceramics with such properties can be applied to ultra-high temperature broadband radome structures and thermal insulators.
AB - This study introduced a new structural/functional porous yttrium silicate (Y2SiO5) ceramic, which was prepared using a water-based freeze-casting technique. Moreover, the effects of sintering temperature on the microstructure, compressive strength, thermal conductivity, and dielectric properties of porous Y2SiO5 ceramics were investigated. The microstructure consisting of 3-D interconnected pores were created using the freezing process, and the formation mechanism was discussed. The microstructure observation indicated an increase in the sintering temperature from 1250°C to 1450°C and a decrease in porosity from 71% to 62%. In addition, the pore channel size decreased from 50μm to 25μm, but the average grain size increased from 1.0μm to 3.0μm. Consequently, the compressive strength, thermal conductivity, and dielectric constant of the porous Y2SiO5 ceramics increased from 3.34MPa to 16.51MPa, from 0.07W/mK to 0.22W/mK, and from 1.89 to 2.22, respectively. Porous Y2SiO5 ceramics with such properties can be applied to ultra-high temperature broadband radome structures and thermal insulators.
UR - http://www.scopus.com/inward/record.url?scp=84871446519&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2012.11.020
DO - 10.1016/j.matdes.2012.11.020
M3 - Article
AN - SCOPUS:84871446519
SN - 0264-1275
VL - 46
SP - 746
EP - 750
JO - Materials and Design
JF - Materials and Design
ER -